OTHER FINANCIAL DATA - VARIABLE INTEREST ENTITIES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Variable Interest Entities Disclosure [Abstract]
Equity of variable interest entity	$ 87		$ 91
Secured debt of variable interest entity	332
Amounts Associated With Variable Interest Entities, Operating Revenues, Electric	0	(1)
Amounts Associated With Variable Interest Entities, Operating Revenues, Gas	0	0
Amounts Associated With Variable Interest Entities, Total Operating Revenues	0	(1)
Amounts Associated With Variable Interest Entities, Cost of Electric Fuel And Purchased Power	(18)	(17)
Amounts Associated With Variable Interest Entities, Operation And Maintenance	5	17
Amounts Associated With Variable Interest Entities, Depreciation And Amortization	7	7
Amounts Associated With Variable Interest Entities, Total Operating Expenses	(6)	7
Amounts Associated With Variable Interest Entities, Operating Income (Loss)	6	(8)
Amounts Associated With Variable Interest Entities, Other Income (Expense), Net	0	0
Amounts Associated With Variable Interest Entities, Interest Expense	(4)	(3)
Amounts Associated With Variable Interest Entities, Net Income (Loss)	2	(11)
Amounts Associated With Variable Interest Entities, (Earnings) Losses Attributable Noncontrolling Interests	(2)	11
Amounts Associated With Variable Interest Entities, Earnings	$ 0	$ 0